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Following diagram is from a Wikipedia article which shows Quantum Correlation for local hidden variables and Quantum Mechanics and experiments confirm Quantum Mechanics predictions.

enter image description here

My question is why the curve at left side (0-180 degree) is not symmetric with the curve on right side (180-360 degree) although on each side the curve is symmetric with horizontal line?

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up vote 1 down vote accepted

Because of sloppy drawing. The curve should be symmetric.

Solution: pay graphic artists more! :D

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Wondering how cosine could be asymmetric or I'm missing something about Bell's theorem. – Xaqron May 24 '13 at 2:43

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